linux-kernel - Re: [PATCH v5 2/3] extcon: Palmas Extcon Driver

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Date:	Mon, 27 May 2013 14:54:12 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Laxman Dewangan <ldewangan@...dia.com>
CC:	Chanwoo Choi <cw00.choi@...sung.com>,
	"myungjoo.ham@...sung.com" <myungjoo.ham@...sung.com>,
	"balbi@...com" <balbi@...com>,
	"gg@...mlogic.co.uk" <gg@...mlogic.co.uk>,
	"lgirdwood@...il.com" <lgirdwood@...il.com>,
	"broonie@...nel.org" <broonie@...nel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
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	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"george.cherian@...com" <george.cherian@...com>,
	"sameo@...ux.intel.com" <sameo@...ux.intel.com>
Subject: Re: [PATCH v5 2/3] extcon: Palmas Extcon Driver

Hi,

On Monday 27 May 2013 12:26 PM, Laxman Dewangan wrote:
> On Monday 27 May 2013 12:11 PM, Kishon Vijay Abraham I wrote:
>> Hi,
>>
>> On Monday 27 May 2013 12:06 PM, Laxman Dewangan wrote:
>>> On Monday 27 May 2013 12:01 PM, Kishon Vijay Abraham I wrote:
>>>> Hi,
>>>>
>>>> On Monday 27 May 2013 11:52 AM, Laxman Dewangan wrote:
>>>>> On Monday 27 May 2013 11:38 AM, Chanwoo Choi wrote:
>>>>>> On 05/27/2013 02:54 PM, Kishon Vijay Abraham I wrote:
>>>>>>> Hi,
>>>>>>>
>>>>>>> On Monday 27 May 2013 11:04 AM, Chanwoo Choi wrote:
>>>>>>>> Hi Kishon,
>>>>>>>>
>>>>>>>> I have some comment about this patch
>>>>>>>> and upload modified patch to following repository
>>>>>>>> (extcon-for-palmas).
>>>>>>>> -
>>>>>>>> http://git.kernel.org/cgit/linux/kernel/git/chanwoo/extcon.git/commit/?h=extcon-for-palmas&id=f2b7cb80699cbe1a5fd6c97ef2c600915f8d7f2c
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> This patchset include patch related to other module
>>>>>>>> ,so I need your opinion to apply this patchset to git repository.
>>>>>>> yeah.. Still there is some confusion with
>>>>>>> palmas_set_switch_smps10().
>>>>>>> I think we can remove it for now and add it separately later. By
>>>>>>> this
>>>>>>> at least we can have device mode fully functional in OMAP5. What do
>>>>>>> you think?
>>>>>>>
>>>>>>     I agree your opinion.
>>>>>>
>>>>>> But, I propose some fixes about palmas_set_switch_smps10().
>>>>>> I dont' prefer to call global function in exton-palmas.c from
>>>>>> palmas-regulator.c.
>>>>>> So, Why don't you use regulator consumer instead of global function?
>>>>>> You can register specific regulator for enabling or disabling
>>>>>> SMPS10_SWITCH_EN
>>>>>> and then control SMPS10_SWITCH_EN bit through regulator framework in
>>>>>> extcon-palmas.c
>>>>>> without calling global function.
>>>>> Along with this, I also like to make the VBUS regulator control to be
>>>>> optional here. Currently it is mandatory.
>>>> But dint you just tell on my v4 of this patch that you don’t require
>>>> this.
>>>> http://www.spinics.net/lists/linux-doc/msg10638.html
>>> In V4, I said remove this VBUS control and my mean was to remove all
>>> regulator calls for VBUS enabled/disable.
>>> I saw you just remove the platform data option to have this control and
>>> made VBUS mandatory.
>>>
>>> Probably some gap here.
>> Indeed..
>> I think then we should stick back to how it was with my v4 or else it
>> would break OMAP. The regulator calls can't be moved anywhere else as it
>> is specific to PALMAS.
>>
>
> I was thinking that extcon driver just detect the cable type and notify
> to the client. After cable detection, the next level of configuration
> should be done in the respective client.
>
> On Tegra platform,  for ID pin detection, Tegra SOC is capable of detect
> the ID pin presence or Palma is capable. Depending on the board design,
> how the ID pin routed from USB connector to PMIC or to Tegra, we enable
> corresponding detection logic.
> Once the USB driver got notification for ID pin presence (by any means),
> the enabling of VBUS (as the Tegra will work as Host now and need to
> supply VBUS), is done in USB driver.
> Not sure about the OMAP here.

I think I got your point here. Will check and send a patch.

Thanks
Kishon
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